Denver-based Frontier Airlines has its eyes on leisure travelers with the addition of several new routes in the U.S. and Caribbean.

The ULCC carrier on Tuesday announced the addition of several new non-stop flights and routes between 8 cities, all geared for sun-seekers and vacation-goers.

Four daily non-stop flights will be added between Las Vegas and Miami, Milwaukee, Houston and San Francisco. On the east coast, Florida and the Caribbean get some new routes, with new service between Orlando and Indianapolis, Los Angeles and Philadelphia. Philly also will have new routes to Ft. Myers, Fla. and Montego Bay, Jamaica.

The flights were added due to market demand, according to a company release.

Denver’s Frontier Airlines is turning 21, and they’re throwing a party where you get the gift of cheap tickets.

From Denver, travelers can fly one-way to Austin, Phoenix, Salt Lake City, Bozeman, Kansas City and Las Vegas for $21. Tickets must be purchased by 11:59 p.m. June 30 and are good for travel on Tuesdays, Wednesdays, and Saturdays from Aug. 22, 2015 through Nov. 18, 2015 and Dec. 2, 2015 through Dec. 16, 2015.

Other routes are on sale from $39 to $99.

Buy a $21 ticket, take the ride. (Frontier)

And, if humans dressed up like big furry “spokes animals” handing out birthday cake won’t give you nightmares, the airline plans to throw a “pre-flight birthday party” on July 6 for their party flight to Las Vegas. Winners of a recent social media contest will board, along with other passengers, for a party in the sky that includes giveaways and free champagne.

Chicago counts for nine of the top ten messy airline routes in the U.S. Colorado has two. (Graphic via WSJ)

Where are the nation’s biggest air travel trouble spots? The Wall Street Journal today debuted a neat little searchable widget to answer that question. And, as it turns out, and Colorado has two in the top ten.

Chicago-based United Airlines will now fly directly from Denver to Liberia and San Jose, Costa Rica, starting Dec. 18.

Right now, United is taking reservations for flights on weekends between Dec. 18 and April 30. The Costa Rican cities are the two most-in-demand Central American destinations from Denver, which drove the airline’s decision to add the flights, spokeswoman Mary Ryan said.

The new routes provide a way for flyers from more than 40 locations to reach to the Central American country by connecting through Denver, according to United.

Everyone loves celebrating birthdays, and YouTube is no exception. As part of their 10-year anniversary, the Google-owned video behemoth compiled top videos, including the top ads that have made an appearance on the web channel.

This clever Turkish Airlines ad, starring L.A. Lakers shooting guard Kobe Bryant and Barça football star Lionel Messi engaged in a selfie war around the globe, has been awarded the “Your Favorite” YouTube ad of the past decade.

The spot, which had more than 25 million views within its first three days online, was developed by Boulder-based Crispin Porter + Bogusky.

YouTube analyzed the popularity of videos by tallying “votes” of consumer views while also asking advertisers, marketers and other professionals to weigh in. They learned four of 2014’s top trending videos were created by advertisers.

Turkish Airlines is seeing remarkable growth in recent years. On May 15, the airline announced a record $153 million first-quarter 2015 profit, a capacity increase of 9.4 percent (in available seat km) over the same time last year, and a total passenger increase of 6.5 percent, according to a statement.

Turkish Airlines serves 271 destinations in 109 countries with a fleet of 274 aircraft, according to their website.

New boarding process gives preferential treatment to gluten intolerant people, and those named Steve, among others. (Photo: Spirit Airlines)

Spirit Airlines, the ultra-low cost carrier based in Miramar, Fla., unveiled new boarding procedures that the company feels will lead to fewer complaints.

“We understand the boarding process for most airlines can be lengthy, confusing, and frankly insulting,” Sidd Finch, Spirit’s director of boarding procedures, said in an emailed statement. “It’s important to clearly define who should board and when they should be given access to the aircraft.”

The new Spirit Superiority Boarding, which goes into effect on April 1, 2015, gives customers the following priority boarding:

• DishLatino in Englewood ‘fessed up that a fuzzy cellphone video of an unidentified streaker interrupting a soccer game and scoring a goal was part of a DishLatino promotion. The guy is actually Eugenio Derbez, “who has been ranked as the most influential Hispanic celebrity in the U.S.,” Dish says.

• Kindara, the fertility app based in Boulder, was mentioned in a TechCrunch April Fools story about a new gadget, the Pokr, to check cervical mucus. Did Kindara know this was going to happen? “No we didn’t! LOL,” said William Sacks, Kindara’s co-founder and CEO.

February 20, 2015: The “tents” reflected on the Denver Airport Westin at the Denver International Airport. February 20, 2015 Denver, CO (Photo By Joe Amon/The Denver Post)

About 13 million customers from more than 160 countries voted in the annual Skytrax global airport customer satisfaction survey, ranking airports, their staff and amenities like hotels for the annual World Airport Awards, also known as the Passenger Choice Awards.

And, turns out, travelers like Denver. They really like Denver.

DIA ranked eighth in large airports, which are those with more than 50 million passengers per year, and was one of only two Read more…

United Airlines President and CEO Jeff Smisek, center, with Denver Mayor Michael Hancock, at left, and Kim Day, CEO of Denver International Airport, at a 2012 press conference in Denver. (Helen H. Richardson, The Denver Post)

At the center of the petition is the outsourcing of jobs, which the petition calls “a cancer that must be stopped.” It also calls Smisek out for cutting costs at the expense of services and taking steps that damage retirees — all actions the group claims to be contrary to Smisek’s sworn testimony before Congress, when he said the 2010 merger between Continental and United would have no “significant effect on employment on frontline jobs.”

“It will provide them with good jobs — careers, and not just jobs; and retirements, secure retirements, and not just hope. It will provide us with the synergies that will permit us to continue to invest in our employees. And I have made it very clear that the wealth creation of this merger, that I intend to share that with all work groups, whether they are unionized or not,” Smizek said before Congress on June 16, 2010, according to Congressional records.

The vendors at Denver International Airport do not care if you’ve been naughty or nice this year … they’re still going to give you free stuff.

Retail shop and restaurant owners at Denver International Airport (DIA) will give away 100,000 gifts to travelers this holiday season as a thank you for shopping at the airport locations. (Image: DIA)

Airport restaurants and shops are giving away 100,000 gifts to travelers every day from Dec. 20 through Jan. 4. How to get one? Spend a one-day total of $20 at DIA stores or restaurants — yes you can combine receipts — and bring your receipts to one of four giant gift boxes in the airport. Read more…

A plain, white toy airplane arrived at my desk Wednesday morning from the Denver-based carrier. Every bit of color was removed except for a little green near the engines and a red question mark on the tail — the place typically reserved for one of Frontier’s endearing animals.

Frontier just revamped its livery last year, replacing the green paint that simply said “FRONTIER” with its website address “FLYFRONTIER.COM”.

Laura Keeney writes about aerospace and airlines for The Post. When she's not at work, you can usually find her taking in live music, reading voraciously, or doing something science-related and nerdy. She also loves The Clash ... a lot.

Emilie Rusch covers retail and commercial real estate for The Post. A Wisconsin native and Mizzou graduate, she moved to Colorado in 2012. Before that, she worked at a small daily newspaper in South Dakota. It's the one with Mount Rushmore.